How the wait calculator works

The short version

Most "green-card calculators" multiply your backlog by a single recent pace and print one number. The Visa Bulletin doesn't move that simply — it jumps, stalls, and moves backward. So we did something different: we kept the entire official record, tested a dozen forecasting methods against 16 years of history, and shipped the one that was both the most accurate and the most honest about its uncertainty.

1. The data

We maintain the complete U.S. State Department Visa Bulletin record — every monthly Final Action Date since 2010 (≈197 bulletins), for each employment category and country of birth. It's scraped directly from travel.state.gov, spot-verified against the official tables, and refreshed automatically each month when the new bulletin posts. The calculator reads this record — not a hand-typed snapshot.

2. Choosing the method — a back-tested bake-off

We ran a rolling-origin backtest: stand at a past month, forecast the cutoff 1–5 years out using only data available then, and compare to what actually happened — repeated across 34 starting points. Each method is scored on point error (MAE/RMSE, in months of cutoff), interval calibration (does the "80% range" actually contain the truth ~80% of the time?), and CRPS (a proper score for the whole predictive distribution; lower is better).

The winner — a robust Theil–Sen trend for the center line plus a conformal band sized from out-of-sample residuals — nearly halved CRPS versus every alternative. Trend methods (OLS) had great point accuracy but their intervals were badly oversized (Cover₈₀ = 1.00 means a "80% range" that really covered 100%); the bootstrap captured the lumpy moves but ran wide. Calibrating the band to its true 80% is what won.

3. Calibration check

A range is only meaningful if it's calibrated. Using leave-one-out residuals (no peeking at the answer), our 80% range covered the real outcome at every horizon:

4. Validation across categories

The method wasn't tuned to one case. Re-run for every backlogged category-and-country, the 80% coverage holds near target throughout:

Combinations that are currently "Current," or that only recently developed a backlog (too little history to validate), are deliberately left without an estimate rather than given a shaky one.

5. Is the trend even real? (statistical significance)

We test whether the cutoff's movement is statistically distinguishable from (a) standing still and (b) "keeping pace" with real time. For the heavily-backlogged categories the trend is significantly positive — but significantly slower than keeping pace, which is the formal way of saying the backlog is growing, not just anecdotally. Our chosen method also beat the naive baseline with a Diebold–Mariano test (p < 0.01) — its edge isn't luck. (We use autocorrelation-aware tests; a naive p-value would overstate confidence on a trending series.)

6. Heavily backlogged categories: place in line

For the worst backlogs (India and China EB-2/EB-3), projecting the cutoff’s speed is the wrong tool — it only watches the cutoff clear the thin, already-drained front of the line and can’t see the hundreds of thousands of people behind it. So for those categories we lead with a place-in-line estimate:

wait ≈ (approved petitions ahead × spouse/children) ÷ (green cards issued per year for your category + country)

The backlog comes from USCIS’s “approved petitions awaiting visa availability” report; the annual supply from the State Dept Annual Report (Table V, consular + adjustment of status). We validated this engine two ways: the queue density implied by the flow of visas and by the standing backlog agree at order of magnitude, and the same formula correctly reproduces the cutoff’s observed speed today. The honest answer for a recent India EB-2 priority date is decades to a lifetime — not the ~25 years a speed projection implies. Supply swings a lot year to year (rare spillover years issue far more), which is why we show a wide range.

7. What it can't do

The Visa Bulletin is driven by demand, per-country limits, and policy — forces not in the historical series. It can retrogress (move backward), as it has before. Even our best-validated method is off by roughly two years on average at long horizons. So the calculator always shows a widening range, never a precise date, and refuses to estimate when the data can't support one. Use it to plan and compare options — not to rely on a specific month.

Place in line — every category & country

Applying the place-in-line method across the board, here’s the wait for someone filing today (the whole current backlog ahead of them), by category and country of birth. “Current” means there’s effectively no line for that combination today.

A few notes on sources: EB-4 (special immigrants / religious workers) and EB-5 (investors) use the same USCIS backlog and DOS supply, though EB-5 supply is a single recent year. Family is a single combined figure per country — the published waiting-list report isn’t broken out by F-category and country together, so we show total family-sponsored only. Other countries (not shown) are generally current across the board.